Other versions exist on this site from various publications. This one is from the Radio Electronics Experimenter from 1990. The bargraph circuit uses the UAA170.
This circuit can act as a shield being controlled by a microcontroller by pin 1 or 2. The...
May 2017 - Mouser Electronics announces the availability of new Toshiba SSM6K N Channel MOSFETs...
This circuit is from a 1987 magazine, but it can still be easily assembled, as the components are...